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Revenue (Tables) | 9 Months Ended
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Sep. 30, 2018
Revenue from Contracts with Customers [Abstract] |
Revenue, Practical Expedient, Remaining Performance Obligation, Description | The Company has elected to apply the optional disclosure exemptions under ASC 606. Therefore, the amount above excludes contracts with an original length of one year or less, contracts for which we recognize revenue based on the amount we have the right to invoice for services performed, and variable consideration allocated entirely to a wholly unsatisfied performance obligation when the consideration relates specifically to our efforts to satisfy the performance obligation and depicts the amount to which we expect to be entitled. As such, consideration for energy is excluded from the amounts above as the variable consideration relates to the amount of energy delivered and reflects the value the Company expects to receive for the energy transferred. Estimates of revenue expected to be recognized in future periods also exclude unexercised customer options to purchase additional goods or services that do not represent material rights to the customer.
Disaggregation of Revenue [Table Text Block] | The following table presents our revenue from contracts with customers and other revenue for the periods indicated (in millions):
| Three Months Ended September 30, 2018
| US and Utilities SBU |  | South America SBU |  | MCAC SBU |  | Eurasia SBU |  | Corporate and Other/ Eliminations |  | Total
Regulated Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers | $ | 759 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 759 |
Other regulated revenue | 18 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 18 |
Total regulated revenue | $ | 777 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 777 |
Non-Regulated Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers | $ | 386 |  |  | $ | 922 |  |  | $ | 440 |  |  | $ | 152 |  |  | $ | (2 | ) |  | $ | 1,898 |
Other non-regulated revenue (1) | 67 |  |  | 1 |  |  | 22 |  |  | 72 |  |  | — |  |  | 162 |
Total non-regulated revenue | $ | 453 |  |  | $ | 923 |  |  | $ | 462 |  |  | $ | 224 |  |  | $ | (2 | ) |  | $ | 2,060 |
Total revenue | $ | 1,230 |  |  | $ | 923 |  |  | $ | 462 |  |  | $ | 224 |  |  | $ | (2 | ) |  | $ | 2,837 |
| Nine Months Ended September 30, 2018
| US and Utilities SBU |  | South America SBU |  | MCAC SBU |  | Eurasia SBU |  | Corporate and Other/ Eliminations |  | Total
Regulated Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers | $ | 2,176 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 2,176 |
Other regulated revenue | 39 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 39 |
Total regulated revenue | $ | 2,215 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 2,215 |
Non-Regulated Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers | $ | 774 |  |  | $ | 2,661 |  |  | $ | 1,211 |  |  | $ | 701 |  |  | $ | (11 | ) |  | $ | 5,336 |
Other non-regulated revenue (1) | 263 |  |  | 3 |  |  | 65 |  |  | 234 |  |  | (2 | ) |  | 563 |
Total non-regulated revenue | $ | 1,037 |  |  | $ | 2,664 |  |  | $ | 1,276 |  |  | $ | 935 |  |  | $ | (13 | ) |  | $ | 5,899 |
Total revenue | $ | 3,252 |  |  | $ | 2,664 |  |  | $ | 1,276 |  |  | $ | 935 |  |  | $ | (13 | ) |  | $ | 8,114 |

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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- Definition Disclosure of accounting policy for revenue recognition. If the entity has different policies for different types of revenue transactions, the policy for each material type of transaction is generally disclosed. If a sales transaction has multiple element arrangements (for example, delivery of multiple products, services or the rights to use assets) the disclosure may indicate the accounting policy for each unit of accounting as well as how units of accounting are determined and valued. The disclosure may encompass important judgment as to appropriateness of principles related to recognition of revenue. The disclosure also may indicate the entity's treatment of any unearned or deferred revenue that arises from the transaction. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18726-107790 Reference 3: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18823-107790 + Details
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